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A plug inspection revealed we could lean the carb from the stock 85/93 jetting. We tried a set of 83/91 jets and scored 5 more horsepower at peak rpm. Most large cfm carbs are calibrated on the rich side for the typical Chevy big-block, which has larger, less efficient parts. We wanted to lean it out a little more, but we would have to wait and see how the bigger pipes worked on our combo.